The LM49350 high performance audio codec sub-system with a ground-referenced stereo headphone amplifier and an ultra low EMI class D loudspeaker amplifier with dual I2S/PCM digital audio interfaces
The LM49350 is a high‑performance audio subsystem that integrates a stereo DAC, stereo ADC, headphone amplifier, earpiece speaker amplifier, and a low‑EMI Class‑D loudspeaker amplifier. It is designed for mobile phones and other portable devices, offering dual bi‑directional I2S/PCM digital audio interfaces and an I²C‑compatible control interface.
Typical applications include smart phones, mobile and VoIP phones, portable GPS navigators, gaming devices, multimedia players, digital cameras, and camcorders. The device provides up to 96 dB DAC SNR, 94 dB ADC SNR, and low power consumption with shutdown current of 2.3 µA.
| Stereo DAC SNR | 96 dB (typ) |
|---|---|
| Stereo ADC SNR | 94 dB (typ) |
| Shutdown current | 2.3 µA (typ) |
| Supply voltage range (D_Vpp) | 1.7 V to 2.0 V |
| Headphone amplifier output power | 69 mW (typ) into 32 Ω load |
The DAC provides a typical signal‑to‑noise ratio of 96 dB at 48 kHz.
It is used in smart phones, mobile phones, VoIP phones, portable GPS navigators, gaming devices, multimedia players, digital cameras, and camcorders.